/*
 * Copyright 2010 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook.android;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class SessionStore {
    
    private static final String TOKEN = "access_token";
    private static final String EXPIRES = "expires_in";
    private static final String KEY = "facebook-session";
    private static final String NAME = "name";
    private static final String ID = "id";
    
    /**
     * Save Facebook user session
     * @param session
     * @param context
     * @return
     */
    public static boolean save(Facebook session, Context context) {
        Editor editor =
            context.getSharedPreferences(KEY, Context.MODE_PRIVATE).edit();
        editor.putString(TOKEN, session.getAccessToken());
        editor.putLong(EXPIRES, session.getAccessExpires());
        editor.putString(NAME, session.getAccessToken());
        editor.putString(ID, session.getAccessToken());
        return editor.commit();
    }
    
    /**
     * Save Facebook user session
     * @param session
     * @param context
     * @return
     */
    public static boolean save(Facebook session, Context context, String name, String id) {
        Editor editor =
            context.getSharedPreferences(KEY, Context.MODE_PRIVATE).edit();
        editor.putString(TOKEN, session.getAccessToken());
        editor.putLong(EXPIRES, session.getAccessExpires());
        editor.putString(NAME, name);
        editor.putString(ID, id);
        return editor.commit();
    }

    /**
     * Returns saved facebook user's name
     * @param context
     * @return
     */
    public static String restoreName(Context context) {
        SharedPreferences savedSession =
            context.getSharedPreferences(KEY, Context.MODE_PRIVATE);
        return savedSession.getString(NAME, null);
    }

    /**
     * Return saved facebook user's id
     * @param context
     * @return
     */
    public static String restoreId(Context context) {
        SharedPreferences savedSession =
            context.getSharedPreferences(KEY, Context.MODE_PRIVATE);
        return savedSession.getString(ID, null);
    }
    
    /**
     * Restore Facebook user session
     * @param session
     * @param context
     * @return
     */
    public static boolean restore(Facebook session, Context context) {
        SharedPreferences savedSession =
            context.getSharedPreferences(KEY, Context.MODE_PRIVATE);
        session.setAccessToken(savedSession.getString(TOKEN, null));
        session.setAccessExpires(savedSession.getLong(EXPIRES, 0));
        return session.isSessionValid();
    }

    /**
     * Clear Facebook user session
     * @param context
     */
    public static void clear(Context context) {
        Editor editor = 
            context.getSharedPreferences(KEY, Context.MODE_PRIVATE).edit();
        editor.clear();
        editor.commit();
    }
    
}
